Website review by
Erin Brereton, Common Sense Media
CryptoKitties Website Poster Image
Leave the virtual cat breeding, buying to adults.

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The parents' guide to what's in this website.

Educational Value

Kids can learn about some genetics concepts -- CryptoKitty combinations can yield four billion potential variations, according to site -- and get basic description of blockchain technology. They'll also get reading practice, may obtain some money management and math experience when deciding what to deposit or spend funds on. While breeding option offers interesting way to illustrate basic genetics principles, not many other kid-focused learning opportunities; it'd likely be a better idea to teach kids how to budget offline with a small amount of real money.

Positive Messages

Site's breeding aspect could spark an interest in biology.



Breeding process doesn't involve any visuals, but some references (such as "OK, give them some privacy") may prompt questions from kids.


Site has a pretty strong spending focus. You need to create a digital wallet and need to spend some money to buy a CryptoKitty to do anything.

Drinking, Drugs & Smoking

What parents need to know

Parents need to know that CryptoKitties is a website based around blockchain and digital cats. While there's no inappropriate content to be found, some comments about breeding digital cats could raise questions about what they mean. The site does have a heavy promotion on spending cash; users have to install a digital MetaMask wallet and buy Ether, a digital currency, to put in it. That can be a little tricky to figure out -- and costs real money.

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What's it about?

CRYPTOKITTIES is a site that's built using the same technology as Bitcoin, known as blockchain. Users pay to buy and breed virtual cats after setting up a digital wallet and spending money on a form of digital payment. Newly born CryptoKitties have attributes determined by each parent's 256-bit genome and an element of chance; after breeding, each kitty has a cool-down period before it can breed again, and these animals can be sold at auction for breeding with other users' animals. Purchase prices that users set decline until the auction ends. CryptoKitties made headlines after its launch for having hefty transactions, reportedly as high as $113,000.

Is it any good?

This digital cash site is an interesting concept, but its complexity is better left to tech-savvy users. Because it involves a blockchain structure, CryptoKitties could, in theory, offer kids a chance to see the emerging technology in practice. It could also offer dynamic budgeting experience, or a deeper understanding of the way genetics work. To do that, though, the site would need more educationally based content; aside from a few brief FAQ descriptions, there really isn't any material that delves deep into what blockchain technology involves or the ins and outs of how genetic material is passed from generation to generation. In addition, CryptoKitties' pay-to-play aspect is a pretty big detriment. Until you put some money into a digital wallet, you can't really do much on the site, aside from looking at cats that are available for sale and for breeding. In its early days, the site apparently gave out some free kitties; today, to get started, users need a MetaMask digital wallet and some Ether, a form of digital payment. They'll also need a computer or laptop that can run the desktop version of Chrome or Firefox, the only two browsers CryptoKitties works on. Kids could potentially get a chance while playing to make budgeting decisions, but given that they have to exchange real money for digital currency to breed or buy kitties, that's not a scenario all parents may be comfortable with.

Talk to your kids about ...

  • Families can talk about spending money online. Can you use the site without paying anything? Does your child feel that spending money on an activity is necessary to make it fun?

  • Breeding creates new cats that each have unique characteristics. Discuss what unique traits your child has, and ask: Can you identify some one-of-a-kind attributes in other people?

  • Talk about respecting differences. Can you think of an example of a situation in which you might be able to make someone feel at ease, if that person was concerned people might focus on something unfamiliar about their appearance, voice, or other physical elements?

Website details

  • Genre: Gaming
  • Pricing structure: Free (Users can view things for free on the site; but to buy, breed, or otherwise participate, you need to spend something. CryptoKitties ranged in late December from 0.0356 to 1010000 ETH; the dollar value varies, but on a recent day was 0.0010 ETH. The site owners take 3.75 percent of each transaction.)
  • Last updated: November 11, 2020

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